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楼房居民有这样的经验:二层以上居民用水刷洗地面时,地面的积水会很快渗下去,损坏下层的顶棚或滴到床上,下层居民深受其害。这是由楼板的纵向裂缝造成的,一间房少则1条,多则几条,既妨碍使用,又影响美观。出现纵向裂缝的原因一般有以下几种:1.预制空心板的混凝土强度高,一般在C25以上,吊装时已达到设计强度的80%以上,而灌缝的细石混凝土强度较低,结合不好,新、旧槎粘结力小,缝内浆少,水化过程有收缩,形成纵向开裂。2.忽视灌板缝的环节,使装配式板之间的整体性受到影响。灌缝前没
The residents of the building have such experience: When the residents above the second floor wash the ground with water, the water on the ground will quickly seep down, damage the underlying ceiling or drip onto the bed, and the residents in the lower levels will suffer. This is caused by the longitudinal cracks in the floor slabs. There are only one, but only a few of the rooms, which are both obstructive and aesthetically pleasing. The reasons for the occurrence of longitudinal cracks are generally the following: 1. The concrete of prefabricated hollow slabs has high strength, generally above C25, and has reached 80% of the design strength when hoisted, but the strength of fine-grained concrete is low, and the combination is not. Well, the new and old mortars have a small adhesive force, a small amount of slurry in the slits, and shrinkage during the hydration process, forming longitudinal cracks. 2. Ignoring the seaming of the screed plate, the integrity between the assembled plates is affected. Not before filling